Malicious PDF — malware analysis report

Static analysis result for SHA-256 589bbd7239be2056…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 18:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1fba08c28a85bd08360cf2d844847949 SHA-1: 99c7aff7de6e4d801082325821586185ccd6de12 SHA-256: 589bbd7239be2056cb70dd4fc555d926e6a065e33853fc93fede36f8042bb99b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'baarspo.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=alphanumeric+series+pdf+gradeup PDF link annotation
    • https://cdn.sqhk.co/leperanurosi/qP7xham/mastercraft_courser_mxt_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/jgSjjjd/daxozibakadewoboxu.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/qihzgcG/prison_run_and_gun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_601fcc649c05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601a0cfe60dbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_602db4f4a62e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fdabf2ea2a6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393901/normal_5fcc8dc54240d.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/nutritional_ergogenic_aids.pdfIn PDF document text
    • https://cdn.sqhk.co/jazepoxamib/ieEjnhQ/mesus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89091e3f-e0eb-4c3f-8088-f611d31d13e6/oxidation_number_of_mercury_in_hg2_2.pdfIn PDF document text
    • http://zuputes.atwebpages.com/how_do_you_restart_a_panasonic_tv.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/73349258812.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/61355104663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4d8924-950b-4ef2-b60b-948693afd76d/what_is_a_sports_feature_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a398f20c-f5a6-4b5e-88e7-3422b7e2ab75/jegapasatifepam.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/difiwosegeniputunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cbc11f-9ffa-4d53-82d8-e5a56f408655/oll_algorithms_cubehead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2893122b-8c11-4ce6-9a27-2bbfd62aaccb/46644263253.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/special_26_movie_all_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/beponazolamemilusopokeja.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 5556 bytes
SHA-256: 0e37f62df4800511d490b35ddc23c58906f6da0ee8ae2a5f05c2a7965274ada8
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 10988 bytes
SHA-256: a713a5508dc05ecb9d9c9befbf792db9f33e75991017c51994c9c75ba31e37d2